Limited offline backdrop support is possible by selecting 'show online media slideshow' and deselecting all web options (Google images etc.) in Options/Theatre View/Themes. This results in any pictures contained in music album getting displayed as a backdrop in theatre view.
However...
- There is no way to distinguish between images intended to be backdrops and those that are not. So, for example, Folder.jpg is also used, which often looks pretty bad as a backdrop.
- The backdrop also only changes when moving between albums from different artists (not good if you want a specific backdrop for a specific album, esp if you sort by artist)
- Offline video backdrops do not work at all.
- Enabling 'show online media slideshow' results in a fade-out/in when navigating to media that does not use or have backdrops - such as TV, Photos etc. So if you only have one wallpaper for a Skin (e.g. I just use Bing picture of the day) you get a weird fade out/in of the same picture.
Feature requests:
(1) Only use images named Backdrop.jpg (or allow some naming convention) for offline backdrops
(2) Fix offline backdrops for video files/BR/DVD folders (very longstanding bug???!!!)
(3) Make the backdrop change when navigating from album to album, even if the artists is unchanged
(4) Only fade-out/in if a backdrop is actually going to change (or allow it to be disabled for different media types)